Click the Mouse to recenter the image at that point

Keys: z,x to Zoom In, Out

In the Bottom Left list of Parameters: Click on a check box to select a parameter to change, Move the Mouse back over the image and use the Middle Mouse Wheel to change that parameter and see how it animates the fractal. Or directly enter a value in the input box

In the Upper Left list: Use "Reduce Change in Wheel Param" to get smaller changes in parameters